package com.chai.service;

import com.alibaba.dubbo.config.annotation.Reference;
import com.chai.pojo.Permission;
import com.chai.pojo.Role;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

import java.util.HashSet;
import java.util.Set;

@Component
public class SpringSecurityUserService implements UserDetailsService {

    @Reference //注意：此处要通过dubbo远程调用用户服务
    private UserService userService;

    //根据用户名查询用户信息
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        //远程调用用户服务，根据用户名查询用户信息
        com.chai.pojo.User user = userService.getUserByUsername(username);
        if (user == null) {
            //用户名不存在，抛出异常UsernameNotFoundException
            return null;
        }
        Set<GrantedAuthority> auths = new HashSet<>();
        Set<Role> roles = user.getRoles();
        for (Role role : roles) {
            Set<Permission> permissions = role.getPermissions();
            for (Permission permission : permissions) {
                //授权
                auths.add(new SimpleGrantedAuthority(permission.getKeyword()));
            }
        }
        /**
         * User()
         * 1：指定用户名
         * 2：指定密码（SpringSecurity会自动对密码进行校验）
         * 3：传递授予的角色和权限
         */
        System.out.println("roles = " + roles);
        System.out.println("username = " + user.getUsername());
        System.out.println("auths = " + auths);
//        UserDetails userDetails = new User(username, user.getPassword(), auths);
        return new User(user.getUsername(),user.getPassword(),auths);

    }
}
